//以前的写法
let apples = ['🍎', '🍏'];
let fruits = ["1",'🍉', '🍊', '🍇'].concat(apples);

console.log( fruits );//=> ["1","🍉", "🍊", "🍇", "🍎", "🍏"];

//使用拓展运算符
let fruits2 = ['2','🍉', '🍊', '🍇', ...apples];

console.log( fruits2 );